如何使用“尝试捕获”在颤音中进行错误处理

Question

我有一个API端点，当我插入重复条目时返回错误响应。我需要使用尝试捕获量捕获此错误响应，以便将此响应作为吐司消息传递。这是我尝试过的API响应结构和API消耗代码：

// companyService
Future<Object?> createCompany(Company company) async {
try {
  var content = jsonEncode(company.toJson());
  accessToken = await sharedPref.read(key);
  searchUrl = "$baseUrl/company";
  var response = await http.post(
    Uri.parse(searchUrl),
    body: content,
    headers: {
      "Content-Type": "application/json",
      "Authorization": "Bearer $accessToken",
    },
  );
  if (response.statusCode == 201) {
    return company;
  } else {
    return null;
  }
} catch (e) {
  print('objectError: $e');
  return e;    
}

// companyFactory
createCompany(
  name,
  domain,
  address,
  cityId,
) async {
  final company = Company(
    name: name,
    domain: domain,
    address: address,
    cityId: cityId,
  );     
try {
  CompanyService requests = CompanyService();
  await requests.createCompany(company);
  return company;
} catch (e) {
  print('objectError: $e');
  return e;
}
  }